Columnar UDFs is still a work in progress. For now, all UDFs are
row-based, and in fact, all processing is row based. We are working on
plumbing in more columnar support to Spark
https://github.com/apache/spark/pull/24795 but it is going to be a little
while before we are at the point where we
Hello,
I've (nearly) implemented a DSV2-reader interface to read particle physics
data stored in the ROOT (https://root.cern.ch/) file format. You can think
of these ROOT files as roughly parquet-like: column-wise and nested (i.e. a
column can be of type "float[]", meaning each row in the column
